#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;
class Solution {
public:
    string toLowerCase(string s)
    {
        for (int i = 0; i < s.size(); i++)
        {
            if (s[i] >= 'A' && s[i] <= 'Z')
            {
                s[i] += 32;
            }
        }
        return s;
    }
};
int main()
{
    Solution s1;
    string s;
    cin >> s;
    s1.toLowerCase(s);
    return 0;
}